TM 5-4210-220-122-11. FIREFIGHTING OPERATIONS-Continuedb.Structural Firefighting(1)Stop the vehicle and idle the engine. Engage the parking brakes by pushing in button (1) and set thetransmission shift lever (2) to N (neutral).(2)Set the mode switch (3) to STRUCT.(3)Play out the connect suction hoses to water supply insuring that connections are tight and all drains anddischarge ports are closed.NOTEWhen water must be supplied via the water tank, connect hoses between the source,(hydrant, pump, tanker) and the rear auto fill valve. Set the rear auto tank fill valve switch toON (see para. 2-5). Maintain switch OFF when not in use.When water must be supplied via drafting, connect hoses between water source (open pond,holding tank) and suction ports on vehicle. Be sure that all internal and external strainers arein place.(4)If use of the tank supply is required, set the tank valve switch (4) to OPEN.NOTEMaintain the switch CLOSED when water is provided via the suction manifold.(5)Play out and attach hoses to the discharge ports as required.Change 3 2-52